html, body {
  background-color: rgb(0,0,0);
  margin: 0;
  padding: 0;
  overflow:hidden;
}
canvas {
  padding-left: 0;
  padding-right: 0;
  margin-left: auto;
  margin-right: auto;
  display: block;
  width: 800px;
}

canvas {
  /*cursor:none;*/
}